Geodesic
Note on Transformations of Posets with the Same Upper Bound Graph and Minimal Elements
Bulletin of the Malaysian Mathematical Society, Tome 29 (2006) no. 2

Voir la notice de l'article provenant de la source BMMS

Two posets with the same canonical poset and the same upper bound graph can be transformed into each other by a finite sequence of two kinds of transformations, called x y -additions and x y -deletions on minimal elements.
Classification : 05C62. 
Kenjiro Ogawa; Morimasa Tsuchiya. Note on Transformations of Posets with the Same Upper Bound Graph and
      Minimal Elements. Bulletin of the Malaysian Mathematical Society, Tome 29 (2006) no. 2. http://geodesic.mathdoc.fr/item/BMMS_2006_29_2_a7/
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     year = {2006},
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